Gastro-Embryology
Endoderm- forms mucosa of the gut
Surrounding lateral plate mesoderm differentiates into smooth muscle and
visceral peritoneum
Dorsal mesentery farmed by mesoderm fusing, this suspends the adult gut.
Embryonic gut at 28 days is attached to the yolk sac via the vitelline duct (or yolk
stalk).
Derivatives of primitive gut tubes
Pharynx
o Pharyngeal pouches
Foregut
o Larynx, trachea and lungs
o Pharynx and oesophagus
o Stomach and proximal part of the duodenum
o Pancreas
Midgut
o Distal half of the duodenum
o Jejunum
o Caecum and appendix
o Ascending colon and 2/3 of transverse colon
Hindgut
o Left 1/3 of transverse colon
o Descending colon
o Sigmoid colon
o Rectum and upper anal canal
Parasympathetic innervation relate to these divisions:
Vagus nerve:
o Foregut
o Midgut
o Kidneys
Pelvic nerve:
o Hindgut
o Bladder
o Reproductive organs
Sympathetic innervation:
Coeliac ganglion:
Endoderm- forms mucosa of the gut
Surrounding lateral plate mesoderm differentiates into smooth muscle and
visceral peritoneum
Dorsal mesentery farmed by mesoderm fusing, this suspends the adult gut.
Embryonic gut at 28 days is attached to the yolk sac via the vitelline duct (or yolk
stalk).
Derivatives of primitive gut tubes
Pharynx
o Pharyngeal pouches
Foregut
o Larynx, trachea and lungs
o Pharynx and oesophagus
o Stomach and proximal part of the duodenum
o Pancreas
Midgut
o Distal half of the duodenum
o Jejunum
o Caecum and appendix
o Ascending colon and 2/3 of transverse colon
Hindgut
o Left 1/3 of transverse colon
o Descending colon
o Sigmoid colon
o Rectum and upper anal canal
Parasympathetic innervation relate to these divisions:
Vagus nerve:
o Foregut
o Midgut
o Kidneys
Pelvic nerve:
o Hindgut
o Bladder
o Reproductive organs
Sympathetic innervation:
Coeliac ganglion:
